Government keeping its method to crack San Bernardino iPhone 'classified'

Revealed: After postponing a court hearing with Apple, the FBI is testing a new technique which Apple says they will pressure government to reveal

A new method to crack open locked iPhones is so promising that US government officials have classified it, the Guardian has learned.

The Justice Department made headlines on Monday when it postponed a federal court hearing in California. It had been due to confront Apple over an order that would have forced it to write software that would make it easier for investigators to guess the passcode for an iPhone used by San Bernardino gunman Syed Farook.